Tube heat exchanger
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Help request: Background: To cool the high-temperature exhaust gases from the engine, a heat exchanger needs to be designed such that its resistance is not too high, as this could affect the engine’s performance. Option 1: Temporarily use a tubular heat exchanger, with the exhaust gas flowing through the tube side and the laboratory cooling water flowing through the shell side. Space: The position is already fixed; the outer diameter is 250±10 mm, and the length is 300±50 mm. Exhaust gas: inlet temperature 400°C, flow rate 1000 kg/h, outlet temperature? ℃(To be determined; needs to be calculated, less than 220°C) Cooling water: inlet temperature of 20°C, flow rate of 3500 kg/h, outlet temperature of 50°C (or a higher temperature is also acceptable, as there is an external circulating water cooling tower). Questions: 1. With this design, will the cooling water boil? By how much can the exhaust gas temperature be reduced? 2. Given the known structure, is it possible to calculate parameters such as heat exchange efficiency and heat transfer coefficients in order to infer temperature changes inversely? 3. Are there any existing books, materials, or software that can be used for design or verification?
In terms of spatial position, is the length 300 mm or 3000 mm?
It is recommended to use internally finned tubes inside the tubes, in order to increase the residence time of the flue gas within them and thereby enhance the heat exchange efficiency! My humble opinion! Thank you!
Would that increase resistance? Increased resistance has a significant impact on the engine
The fins are generally spiral-shaped; as the gas flows in the same direction, there is no gas resistance
Logically, allowing flue gas to flow outside the ducts, and using fins can increase heat exchange efficiency while reducing pressure losses；
This post was last edited by wiseboy on 2019-3-7 09:34. If you don’t want to waste time and want to get the correct answer quickly, please contact me at htcsoft@163.com. For a heat exchanger of this small size, any attempts to make guesses based on \"experience or principles\" are unreliable. This heat exchanger must have a special design, and I have already developed a perfect one that meets all of your requirements. Some of the results are excerpted as follows:
Isn’t this the auxiliary calculation tool for Heat Exchanger Masters?
Yes, thank you. I don’t have a budget for design at the moment. If your method is feasible, could you have designers on your end create it and send over the physical product?
Does Shanghai Weimo do the same as you?